/* ============================================
   TypeFlow — CSS Custom Properties & Themes
   ============================================ */

:root {
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Accent colors */
  --accent: #6c63ff;
  --accent-glow: rgba(108, 99, 255, 0.4);
  --correct: #4ade80;
  --incorrect: #f87171;
  --incorrect-bg: rgba(248, 113, 113, 0.15);

  /* Spacing */
  --card-padding: 2.5rem;
  --card-radius: 16px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;
}

/* Dark theme (default) */
[data-theme="dark"] {
  --bg-primary: #0a0a0f;
  --bg-card: rgba(255, 255, 255, 0.06);
  --bg-card-border: rgba(255, 255, 255, 0.1);
  --text-primary: #f0f0f0;
  --text-secondary: rgba(255, 255, 255, 0.5);
  --text-muted: rgba(255, 255, 255, 0.25);
  --text-correct: var(--correct);
  --text-incorrect: var(--incorrect);
  --text-untouched: rgba(255, 255, 255, 0.3);
  --caret-color: var(--accent);
  --kbd-bg: rgba(255, 255, 255, 0.1);
  --kbd-border: rgba(255, 255, 255, 0.2);
  --config-btn-bg: rgba(255, 255, 255, 0.06);
  --config-btn-hover: rgba(255, 255, 255, 0.12);
  --config-btn-active-bg: var(--accent);
  --config-btn-active-text: #fff;
  --overlay-bg: rgba(0, 0, 0, 0.6);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
  --history-item-bg: rgba(255, 255, 255, 0.04);
  --history-item-border: rgba(255, 255, 255, 0.08);
}

/* Light theme */
[data-theme="light"] {
  --bg-primary: #f0f0f5;
  --bg-card: rgba(255, 255, 255, 0.65);
  --bg-card-border: rgba(255, 255, 255, 0.8);
  --text-primary: #1a1a2e;
  --text-secondary: rgba(26, 26, 46, 0.5);
  --text-muted: rgba(26, 26, 46, 0.25);
  --text-correct: #16a34a;
  --text-incorrect: #dc2626;
  --text-untouched: rgba(26, 26, 46, 0.3);
  --caret-color: var(--accent);
  --kbd-bg: rgba(0, 0, 0, 0.06);
  --kbd-border: rgba(0, 0, 0, 0.15);
  --config-btn-bg: rgba(0, 0, 0, 0.05);
  --config-btn-hover: rgba(0, 0, 0, 0.1);
  --config-btn-active-bg: var(--accent);
  --config-btn-active-text: #fff;
  --overlay-bg: rgba(255, 255, 255, 0.4);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.1);
  --history-item-bg: rgba(0, 0, 0, 0.03);
  --history-item-border: rgba(0, 0, 0, 0.08);
}

/* ============================================
   Reset & Base
   ============================================ */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* ============================================
   Background
   ============================================ */

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: url('desk-keyboard-bg.png') center center / cover no-repeat;
  z-index: 0;
  pointer-events: none;
}

.bg-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  z-index: 0;
  pointer-events: none;
}

/* ============================================
   Header
   ============================================ */

.header {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-primary);
}

.logo-icon {
  color: var(--accent);
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 10px;
  background: var(--config-btn-bg);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
}

.btn-icon:hover {
  background: var(--config-btn-hover);
  color: var(--text-primary);
}

.btn-icon:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ============================================
   Main
   ============================================ */

.main {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 1.5rem 3rem;
  max-width: 900px;
  margin: 0 auto;
}

/* ============================================
   Glass Card
   ============================================ */

.glass-card {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card);
}

/* ============================================
   Timer Display
   ============================================ */

.timer-display {
  text-align: center;
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 0.75rem;
  opacity: 0.9;
  transition: color var(--transition-fast);
  user-select: none;
}

.timer-display.warning {
  color: var(--accent);
}

.timer-display.danger {
  color: var(--incorrect);
}

/* ============================================
   Config Bar
   ============================================ */

.config-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.config-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.config-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.config-options {
  display: flex;
  gap: 2px;
  background: var(--config-btn-bg);
  border-radius: 8px;
  padding: 2px;
}

.config-btn {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-family);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.config-btn:hover {
  color: var(--text-primary);
  background: var(--config-btn-hover);
}

.config-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.config-btn.active {
  background: var(--config-btn-active-bg);
  color: var(--config-btn-active-text);
  font-weight: 600;
}

/* ============================================
   Live Stats
   ============================================ */

.live-stats {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin-bottom: 1.25rem;
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.live-stats.visible {
  opacity: 1;
}

.live-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
}

.live-stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.live-stat-label {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

/* ============================================
   Typing Area
   ============================================ */

.typing-area {
  position: relative;
  cursor: text;
  min-height: 120px;
  padding: 1rem;
  border-radius: 12px;
  transition: background var(--transition-fast);
}

.typing-area:hover,
.typing-area:focus {
  background: rgba(255, 255, 255, 0.02);
}

[data-theme="light"] .typing-area:hover,
[data-theme="light"] .typing-area:focus {
  background: rgba(0, 0, 0, 0.02);
}

.text-display {
  font-size: 1.25rem;
  line-height: 2;
  letter-spacing: 0.01em;
  word-wrap: break-word;
  user-select: none;
}

.text-display .char {
  position: relative;
  color: var(--text-untouched);
  transition: color var(--transition-fast);
}

.text-display .char.correct {
  color: var(--text-correct);
}

.text-display .char.incorrect {
  color: var(--text-incorrect);
  background: var(--incorrect-bg);
  border-radius: 2px;
}

.text-display .char.current {
  color: var(--text-primary);
}

.text-display .char.current::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 100%;
  height: 2px;
  background: var(--caret-color);
  border-radius: 1px;
  animation: caret-blink 1s step-end infinite;
}

.text-display .space.incorrect {
  background: var(--incorrect-bg);
  border-radius: 2px;
}

.hidden-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  border: none;
  outline: none;
  font-size: 16px; /* prevents iOS auto-zoom on focus */
  /* remove pointer-events: none so it can even be tapped directly */
}


@keyframes caret-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ============================================
   Restart Hint
   ============================================ */

.restart-hint {
  text-align: center;
  margin-top: 1rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.restart-hint.visible {
  opacity: 1;
}

kbd {
  display: inline-block;
  background: var(--kbd-bg);
  border: 1px solid var(--kbd-border);
  border-radius: 4px;
  padding: 0.1em 0.4em;
  font-family: var(--font-family);
  font-size: 0.7rem;
  font-weight: 500;
}

/* ============================================
   Results Overlay
   ============================================ */

.results-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 1.5rem;
  animation: fadeIn 0.3s ease;
}

[data-theme="light"] .results-overlay {
  background: rgba(255, 255, 255, 0.6);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.results-card {
  max-width: 520px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.35s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.results-title {
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.results-wpm {
  text-align: center;
  margin-bottom: 0.5rem;
}

.results-wpm-value {
  font-size: 5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--accent);
}

.results-wpm-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.results-accuracy {
  text-align: center;
  margin-bottom: 1.5rem;
}

.results-accuracy-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
}

.results-accuracy-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-left: 0.4rem;
}

.results-details {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.result-detail {
  text-align: center;
}

.result-detail-value {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.result-detail-label {
  font-size: 0.6rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

/* ============================================
   WPM Chart
   ============================================ */

.results-chart-container {
  margin-bottom: 1.5rem;
  background: var(--history-item-bg);
  border-radius: 10px;
  padding: 1rem;
}

#wpmChart {
  width: 100%;
  height: auto;
  display: block;
}

/* ============================================
   Personal Best & History
   ============================================ */

.personal-best-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: rgba(108, 99, 255, 0.15);
  border: 1px solid rgba(108, 99, 255, 0.3);
  border-radius: 8px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  animation: fadeIn 0.5s ease;
}

.results-history h3 {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  max-height: 120px;
  overflow-y: auto;
  margin-bottom: 1.5rem;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.75rem;
  background: var(--history-item-bg);
  border: 1px solid var(--history-item-border);
  border-radius: 8px;
  font-size: 0.8rem;
}

.history-item-wpm {
  font-weight: 700;
  color: var(--accent);
}

.history-item-accuracy {
  color: var(--text-secondary);
}

.history-item-date {
  color: var(--text-muted);
  font-size: 0.7rem;
}

/* ============================================
   Restart Button
   ============================================ */

.btn-restart {
  display: block;
  width: 100%;
  padding: 0.85rem;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-family);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-restart:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-restart:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ============================================
   Scrollbar
   ============================================ */

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 3px;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  .header {
    padding: 1rem 1.25rem;
  }

  .main {
    padding: 0 1rem 2rem;
  }

  .glass-card {
    padding: 1.5rem;
    border-radius: 12px;
  }

  .timer-display {
    font-size: 2.5rem;
  }

  .config-bar {
    gap: 1rem;
  }

  .config-label {
    display: none;
  }

  .text-display {
    font-size: 1.05rem;
    line-height: 1.9;
  }

  .results-wpm-value {
    font-size: 3.5rem;
  }

  .results-details {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
  }
}

@media (max-width: 480px) {
  .header {
    padding: 0.75rem 1rem;
  }

  .logo-text {
    font-size: 1.1rem;
  }

  .glass-card {
    padding: 1.25rem;
  }

  .timer-display {
    font-size: 2rem;
  }

  .config-bar {
    gap: 0.75rem;
    margin-bottom: 1rem;
  }

  .config-btn {
    font-size: 0.72rem;
    padding: 0.3rem 0.6rem;
  }

  .text-display {
    font-size: 0.95rem;
    line-height: 1.8;
  }

  .typing-area {
    min-height: 100px;
    padding: 0.75rem;
  }

  .live-stat-value {
    font-size: 1.2rem;
  }

  .results-card {
    padding: 1.5rem;
  }

  .results-wpm-value {
    font-size: 3rem;
  }

  .results-details {
    grid-template-columns: repeat(2, 1fr);
  }
}